G.f. satisfies A(A(A(A(x)))) = F(x), where F(x) is the g.f. for A002697(n) = n*4^(n-1).
A372492
G.f. satisfies A(A(A(A(x)))) = F(x), where F(x) is the g.f. for A002697(n) = n*4^(n-1).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =0a(4) =4a(5) =-8a(6) =-8a(7) =288a(8) =-1712a(9) =-1888a(10) =105472a(11) =-288576a(12) =-10404800a(13) =84940672a(14) =1454871936a(15) =-24372060160a(16) =-255228956416
External references
- oeis: A372492